For the Real Spanish Control and Real Spanish Phrasebook materials purchased in our store, the audio is downloaded straight to your computer after purchase (instructions come in a Read Me file in your pack).
To transfer the audio files to your iPod, you have to connect your iPod to the computer so that it shows up in iTunes. Then you have to find and select the files on your hard drive, and drag them onto the iPod button/area in iTunes. Drop them there, and they will be transferred onto your iPod. (Please note, this procedure may change with future updates to iTunes!)